Ruobin Dai,Hongyi Han,Tianlin Wang,Xuesong Li,Zhiwei Wang
The presence of endocrine disrupting compounds (EDCs) in water and wastewater poses potential risks on aquatic environment and human health. Conventional polyamide (PA) nanofiltration (NF) membrane showed poor rejection against EDCs due to unfavorable hydrophobic interaction. In this study, we introduced MoS 2 nanosheets (NS) to PA NF membrane by pre-deposition before the interfacial polymerization process, creating hydrophilic surface and nanochannels in the PA rejection layer to enhance removal of hydrophobic EDCs from wastewater. Results showed that the MoS 2 NS intercalated membrane simultaneously enhanced water permeance and EDCs rejection, with water/EDC selectivity nearly 6 times larger compared to the control. The enhanced EDC rejection was primarily attributed to the suppressed hydrophobic interaction between membrane surface and hydrophobic EDCs, as well as the selective effect by the MoS 2 NS-induced nanochannels. Further calculation based on the solution-diffusion theory indicated that for MoS 2 NS intercalated membranes the selective nanochannels played a more important role than the hydrophilic surface in impeding the transport of EDCs across the PA layer. The feasibility of the MoS 2 NS intercalated PA membrane for EDC removal was also verified using EDC-contaminated real wastewater . The results of this work highlight the potential of using the designed NF membranes for efficient removal of targeted organic micropollutants from water and wastewater.
Ruobin Dai,Hao Guo,Chuyang Y. Tang,Mei Chen,Jiayi Li,Zhiwei Wang
Rejection of endocrine-disrupting compounds (EDCs) by thin-film composite (TFC) polyamide membranes remains a challenging issue in wastewater reclamation applications because of the unfavorable hydrophobic interaction between EDCs and membranes. Herein, we investigated the incorporation of hydrophilic metal organic frameworks (MOFs) into the polyamide layer to create water/EDC selective nanochannels for enhancing EDC rejection. Using MIL-101(Cr) MOF as a nanofiller, the water flux of the MOF0.20 TFC membrane (0.20 wt/v % MOF in n-hexane) was 2.3 times that of the control. The rejection rates against EDCs involving methylparaben, propylparaben, benzylparaben, and bisphenol A (BPA) by MOF0.20 were also significantly higher than the respective values of the control membrane, with the water/EDC selectivity (e.g., A/BBPA) of MOF0.20 approximately doubled compared to that of the control. Further single salt rejection and gold nanoparticle filtration tests confirmed that the hydrophilic nanochannels created by MOFs played a critical role in membrane transport, accounting for the significant enhancement of EDC rejection of the modified TFC membrane. This study demonstrates a promising membrane modification protocol using hydrophilic MOFs for achieving selective removal of EDCs and high-efficient wastewater reclamation using TFC membranes.
危险品化学品经营许可证（带存储）